Date   

Re: ubitx troubleshooting help - low power after irf510 replacement

ajparent1/KB1GMX <kb1gmx@...>
 

Did you replace both?

Did any traces top side or bottom side heat up or disappear.

Scoping stages has been what I consider the least useful step.
Look for smoked parts.

Allison


Re: new build

kg4hlz@...
 

N4ISF DE KG4HLZ. I'm just down in Madison, AL (near Huntsville). Just got mine in the mail as well. If I can get some time to put it together, we might try to set up a QSO. I'm already starting to think if moods.

73s.
Bruce KG4HLZ  


Re: Does anyone have an AGC/Click kit to sell?

Nick VK4PP
 


Re: Harmonics

RCBoatGuy
 

Sweet... 


new build

n4isfino
 

Hi Y'all;  I'm Reuben Titus, N4ISF. Middle TN.   A friend told me about the uBitx so I ordered one yesterday. Figure I will try it for home/portable/mobile,  maybe tie in a tube amp for home use, maybe build me a solid state amp for portable if the power source is good for it,  or not if it's limited to a small battery.   I have a Heathkit 80-100 watt all tube transmitter I started with as novice around 1980 if it still works, (it was old then)  it was an AM-CW only unit but could do SSB with external signal input.   As original it had a drifty tube VFO with crystal option, and the HQ145X receiver that I used was very drifty as well.     Most of my electronics education was early 80's style on back,  the 1982 ARRL amateur handbook was my reference book,  I wore it out and still use it. Spent a lot of time with the QST magazine issues from the 1930's to 80's that I found in a library.     Haven't kept up with modern stuff very well,  but I can try.  And I've been foolin with various things over the years and picked up enough test equipment to play with stuff a little, oscilloscope,  capacitance/inductance meter, signal generators,   etc.  Mostly doing stuff like weird versions of brushless DC motors, making my own electric fence chargers and electronic ignitions for old vehicles,  etc.    So.   New project to get me a working transceiver again.  The kenwood TS820 I have started having issues a while back so I've been thinking of finding something else, something I can carry around and mess with easier.   The 820 likes to stay put (heavy) and the interior is so packed it looks like a challenge to fix. And a bigger challenge to figure out why it's doing what it's doing,  throwing in excessive interference on the received signal and kicking the digital readout off at the same time.    Think I'll put it on ebay sooner or later,  it might sell for enough to recover the cost of the uBitx. since I see a nonworking one on there now that's bid to over $100.




--
N4ISF


VK4PP uBitx add-on Boards. (VK4PLN)

Nick VK4PP
 

Just a note to those interested, I have ordered another set of boards.
Please see here for whats available: https://vk4pp.blogspot.com/

I am still working on others...

73 Nick VK4PP


ubitx troubleshooting help - low power after irf510 replacement

Sean W7SKD
 


I have a bit too much experience with cooking the finals on my ubitx...I'm on about my fourth or fifth set of IRF510s.  I think that I'm probably overdriving too much on digital modes...but here's the question

After the last replacement and re-biasing of the PAs using the standard +100 mA per pot technique, I found that I had decent power on 40m, but had virtually no output on 20m or 17m (where I'd previously seen at least a few watts out).

so...here's my question: did I perhaps damage something other than the irf510s, or do I perhaps have bad irf510s (these were from a different batch)?  I have an oscilloscope and a dvm, but not really 100% sure how to proceed.  I had an idea that I might want to put on a dummy load, use the wsjt-x 'tune' function (with a relatively low drive setting) and then measure at different points, but I'm fairly new to electronics and not sure enough what I'd be looking for. I was thinking perhaps checking each amplification stage, but would need some advice on what to look for.

Ideas?  

Thanks!

Sean


Re: Sunday

iz oos
 

I get 7w with a class E NS40 by 4sqrp. Apart from the layout of the board, a real masterpiece, it is amazing that just after key down the final remains that cold (very mild temp). My other twofer qrp by Hendricks with just 1w the final notwithstanding is biased correctly is hot. Thumbs up for class E... a pity there is no commercial class E amplifier as far as I now.


Il 16/ago/2018 18:40, "Daniel Conklin" <danconklin2@...> ha scritto:
Jack, I'm getting about 4 watts output with 13.8v the way I have it currently configured. It's driven with a 2n7000 MOSFET. I'm wondering if the uBiTX could benefit from this because it requires lower drive levels from the LO. 
Dan  W2DLC 


Re: Harmonic performance - SSB vs CW

Bill Cromwell
 

Those digi modes are done with a set of tones to your radio and use SSB - NOT CW.

73,

Bill KU8H

On 08/15/2018 06:32 PM, peder@nwfood.net wrote:
Could you do a run on Digital? We have a group planning on using this
system to introduce hams to digital. Does the digital approach simply
use the CW system?

Peder, W7RPK
--
bark less - wag more


BITX QSO Afternoon/Evening, Sunday, August 19, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

John P
 

BITX QSO Afternoon/Evening, Sunday, August 19, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Join us as we make contacts with our BitX-40s or uBitXs or anything else on 7.277 MHz in 40 meters!

This is a worldwide event for BitX40 (and other QRP) stations starting at 3PM and 7pm in each time zone. To participate, call CQ BitX on Sunday, starting at 3PM and/or 7PM your local time. The BitX QSO Night continues through the evening and conditions usually improve after sunset, so it is worthwhile to participate later in the evening.

Suggested Best Operating Practices:

Work at QRP power levels unless conditions require more power.
Call and listen for CQ BITX on the hour and every quarter hour.
It is helpful if you call CQ BITX with your callsign, name and location. 
Repeat your callsign a number of times during your CQ BITX and during QSO's.
Start a QSO by confirming the callsign, location, name and signal report of the other operator.
Say the callsign, name and location of the other operator so others can hear.
If the frequency is busy, avoid long conversations.
After your initial QSO is complete, ask if there are any other stations who would like to contact.

Report your QSO's, discuss propagation, noise, signal reports, audio reports, antenna type, etc. in this thread.

This is an undirected, scheduled event.  The BITX QSO Night relies on you to call CQ BITX to initiate contacts with other stations, so warm up that final and transmit a few calls on Sunday evening.  Talk to you then!
--
John - WA2FZW


Re: Modular uBitx - "Ex: Harmonics"

Arv Evans
 

W2CTX

Interesting thought.   We already live with noise from the AVR/Arduino on 16 MHz, 12 MHz,
harmonics of these, and mixed products of those.  Yes, putting any computing device inside
the radio chassis will cause problems.  It is a trade-off for convenience and functionality versus
having a quiet receiver.  Of course if we really want a very quiet receiver we would not be using
double conversion.  Direct-conversion with phase shift methodology replacing filters could
eliminate much of the mixing products of a dual-conversion architecture. 

This does bring up the idea of having a chassis-within-a-chassis to shield the radio from
computer or computer from the radio.  Heating/cooling could be problematic, but not
insurmountable. 

Arv
_._


On Thu, Aug 16, 2018 at 2:19 PM W2CTX <w2ctx@...> wrote:

No one concerned with extra power draw or noise generated by the pi?


On August 16, 2018 at 4:12 PM Eric Flores <floreseric1981@...> wrote:


One of the Rasbberry Pi versions could probably be added inside a transceiver case running Linux.  That could replace an Arduino and PC as well.  

I was thinking along the same lines. This would open up quite a bit of possibilities with all the extra CPU power. 

I liked the suggestion from RCBoatGuy that pertains to this:

- Si5351 on main board, not on Raduino/Teensyduino/JackAl

If the  Si5351 was on the mainboard, then you can use whatever you want for the CPU board and the it via the I2C interface. It would increase the hackable-ness of the uBitx.

Eric

On Thu, Aug 16, 2018 at 1:04 PM Arv Evans < arvid.evans@...> wrote:
One of the Rasbberry Pi versions could probably be added inside a transceiver case running Linux.  That could replace an Arduino and PC as well.  

Arv
_-_



Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: Glenn < glennp@...>
Date: 8/15/18 11:16 PM (GMT-07:00)
Subject: Re: [BITX20] Modular uBitx - "Ex: Harmonics"

I have one of these boards.  It requires a PC plus an external sound card.

There was talk of another board to replace the PC part and display etc, but I don't think anything has come of that.
glenn vk3pe

 

 


Re: Modular uBitx - "Ex: Harmonics"

Eric Flores <floreseric1981@...>
 

No one concerned with extra power draw or noise generated by the pi?

Some people might be concerned about, others may want the RPi so much that they compensate for it. With the suggestion of putting the Si5351 on the mainboard, it would leave options open for the end user.

On Thu, Aug 16, 2018 at 3:19 PM W2CTX <w2ctx@...> wrote:

No one concerned with extra power draw or noise generated by the pi?


On August 16, 2018 at 4:12 PM Eric Flores <floreseric1981@...> wrote:


One of the Rasbberry Pi versions could probably be added inside a transceiver case running Linux.  That could replace an Arduino and PC as well.  

I was thinking along the same lines. This would open up quite a bit of possibilities with all the extra CPU power. 

I liked the suggestion from RCBoatGuy that pertains to this:

- Si5351 on main board, not on Raduino/Teensyduino/JackAl

If the  Si5351 was on the mainboard, then you can use whatever you want for the CPU board and the it via the I2C interface. It would increase the hackable-ness of the uBitx.

Eric

On Thu, Aug 16, 2018 at 1:04 PM Arv Evans < arvid.evans@...> wrote:
One of the Rasbberry Pi versions could probably be added inside a transceiver case running Linux.  That could replace an Arduino and PC as well.  

Arv
_-_



Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: Glenn < glennp@...>
Date: 8/15/18 11:16 PM (GMT-07:00)
Subject: Re: [BITX20] Modular uBitx - "Ex: Harmonics"

I have one of these boards.  It requires a PC plus an external sound card.

There was talk of another board to replace the PC part and display etc, but I don't think anything has come of that.
glenn vk3pe

 

 


Re: Modular uBitx - "Ex: Harmonics"

W2CTX
 

No one concerned with extra power draw or noise generated by the pi?


On August 16, 2018 at 4:12 PM Eric Flores <floreseric1981@...> wrote:


One of the Rasbberry Pi versions could probably be added inside a transceiver case running Linux.  That could replace an Arduino and PC as well.  

I was thinking along the same lines. This would open up quite a bit of possibilities with all the extra CPU power. 

I liked the suggestion from RCBoatGuy that pertains to this:

- Si5351 on main board, not on Raduino/Teensyduino/JackAl

If the  Si5351 was on the mainboard, then you can use whatever you want for the CPU board and the it via the I2C interface. It would increase the hackable-ness of the uBitx.

Eric

On Thu, Aug 16, 2018 at 1:04 PM Arv Evans < arvid.evans@...> wrote:
One of the Rasbberry Pi versions could probably be added inside a transceiver case running Linux.  That could replace an Arduino and PC as well.  

Arv
_-_



Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: Glenn < glennp@...>
Date: 8/15/18 11:16 PM (GMT-07:00)
Subject: Re: [BITX20] Modular uBitx - "Ex: Harmonics"

I have one of these boards.  It requires a PC plus an external sound card.

There was talk of another board to replace the PC part and display etc, but I don't think anything has come of that.
glenn vk3pe

 

 


Re: Modular uBitx - "Ex: Harmonics"

Eric Flores <floreseric1981@...>
 


One of the Rasbberry Pi versions could probably be added inside a transceiver case running Linux.  That could replace an Arduino and PC as well.  

I was thinking along the same lines. This would open up quite a bit of possibilities with all the extra CPU power. 

I liked the suggestion from RCBoatGuy that pertains to this:

- Si5351 on main board, not on Raduino/Teensyduino/JackAl

If the Si5351 was on the mainboard, then you can use whatever you want for the CPU board and the it via the I2C interface. It would increase the hackable-ness of the uBitx.

Eric

On Thu, Aug 16, 2018 at 1:04 PM Arv Evans <arvid.evans@...> wrote:
One of the Rasbberry Pi versions could probably be added inside a transceiver case running Linux.  That could replace an Arduino and PC as well.  

Arv
_-_



Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: Glenn <glennp@...>
Date: 8/15/18 11:16 PM (GMT-07:00)
Subject: Re: [BITX20] Modular uBitx - "Ex: Harmonics"

I have one of these boards.  It requires a PC plus an external sound card.

There was talk of another board to replace the PC part and display etc, but I don't think anything has come of that.
glenn vk3pe


Re: Sunday

ajparent1/KB1GMX <kb1gmx@...>
 

Dan,

No as ubitx for SSB requires a linear amplifier.

The AM class E I have for 160 (IRFz24s) does easy 20W carrier
100% modulated its near 80w.  Efficiency is north of 80%.  I've
been called peanut-whistle with that.

One of the locals has a full legal limit AM for 160 class E modulated
with bridged class D.  Broadcast class audio and 375watts carrier.

Broadcast band AM went this way years ago, saves money for the power!

For AM/CW its the way to go.

Allison


Re: Harmonics

Kees T
 

Carl,

Back of the board is attached.

73 Kees K5BCQ


Re: Arduino Hangs

John (vk2eta)
 

Howard,

No problems. Sorry about the troubles.

The Adafruit board is a good solution. Soldering an si style chip is beyond my skills and patience to learn how to...hihi

73, John


Re: Harmonics

RCBoatGuy
 

Kees, 

I like your filter board layout.  However, I do have a small suggestion to make:  It might be nice to have the snubber diodes for the relay coils on the board rather than off  board.

73,

Carl, K0MWC


Re: Arduino Hangs

Howard Fidel
 

John:
Yes. I cut the 3.3V pin from the Nano to the PCB and the voltage went down to 3.5, which is a little high but OK. The 3.3V from the Nano is not used anywhere on the Nano, it comes out of the USB chip and goes to the connector, nothing else. I suspect that at $3 each, not much testing is done on those Nano boards, although you would think that a high volume product would use a simple bed of nails tester to check all the I/O etc.
I liked the Adafruit board because it has 5v to 3.3V level translators and its own 3.3V supply. It was mailed to me today, so I should have it tomorrow or Saturday since Adafruit is about 20 miles from my QTH. Plus it is a pain to solder those tiny chips.

Thanks for all the help.

Howard

On 8/16/2018 1:54 PM, John wrote:
Howard,

Good test with the 2nd nano. 

Since the si chip gets its 3.3v supply from the nano, did you check that the si chip had the proper supply voltage, just to make sure?

73, John



Re: Modular uBitx - "Ex: Harmonics"

Arv Evans
 

One of the Rasbberry Pi versions could probably be added inside a transceiver case running Linux.  That could replace an Arduino and PC as well.  

Arv
_-_



Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: Glenn <glennp@...>
Date: 8/15/18 11:16 PM (GMT-07:00)
To: BITX20@groups.io
Subject: Re: [BITX20] Modular uBitx - "Ex: Harmonics"

I have one of these boards.  It requires a PC plus an external sound card.

There was talk of another board to replace the PC part and display etc, but I don't think anything has come of that.
glenn vk3pe